3.1.5.1.17 subjectRelHeader

The <subjectRelHeader> element specifies the roles played by subjects in associations.

You use the subjectRelHeader element to supply a header row for a subject relationship table when you want to identify the roles played by the subjects in each column. Each cell in the header row identifies a subject topic that defines a role. When specializing the subjectRelTable element, you can accomplish the same purpose by specializing the cells within the rows to enforce the roles.

Contains

Note: These models represent only the default document types distributed by OASIS. Actual content models will differ with each new document type.
Doctype Content model
subjectScheme ( (subjectRole) (one or more) )

Contained by

Doctype Content model
subjectScheme subjectRelTable

Inheritance

- map/relrow subjectScheme/subjectRelHeader

Example

The subject relationship table in this example establishes environmentFor relationships between operating systems and applications. Based on the subjectRole element, subjects in the first column are operating systems which are the environment for an application, while subjects in the second column are applications that run in that environment. For a user interested in content about the operating system, content about the applications may also be relevant.

<subjectScheme>
  <hasKind>
    <subjectdef keys="operatingSystem">
        <subjectdef keys="linuxOS"/>
        <subjectdef keys="windowsOS"/>
    </subjectdef>
    <subjectdef keys="application">
        <subjectdef keys="IDE">
            <subjectdef keys="eclipseIDE"/>
            <subjectdef keys="visualStudioIDE"/>
        </subjectdef>
        <subjectdef keys="webBrowser">
            <subjectdef keys="firefoxBrowser"/>
            <subjectdef keys="ieBrowser"/>
        </subjectdef>
    </subjectdef>
  </hasKind>
  ...
  <subjectRelTable>
    <subjectRelHeader>
      <subjectRole>
        <subjectdef keyref="operatingSystem">
          <hasRelated keyref="environmentFor">
            <subjectdef keyref="application"/>
          </hasRelated>
        </subjectdef>
      </subjectRole>
      <subjectRole>
        <subjectdef keyref="application"/>
      </subjectRole>
    </subjectRelHeader>
    <subjectRel>
      <subjectRole>
        <subjectdef keyref="linuxOS"/>
        <subjectdef keyref="windowsOS"/>
      </subjectRole>
      <subjectRole>
        <subjectdef keyref="eclipseIDE"/>
        <subjectdef keyref="firefoxBrowser"/>
      </subjectRole>
    </subjectRel>
    <subjectRel>
      <subjectRole>
        <subjectdef keyref="windowsOS"/>
      </subjectRole>
      <subjectRole>
        <subjectdef keyref="ieBrowser"/>
        <subjectdef keyref="visualStudioIDE"/>
      </subjectRole>
    </subjectRel>
  </subjectRelTable>
</subjectScheme>
A table view of the subjectRelTable may look like this; each <subjectRel> represents a single row, and each <subjectRole> represents a cell.
Table 1. subjectRelTable as a table 
<subjectdef keyref="operatingSystem">
 <hasRelated keyref="environmentFor">
  <subjectdef keyref="application"/>
 </hasRelated>
</subjectdef>
 
<subjectdef keyref="application"/>

<subjectdef keyref="linuxOS"/>
<subjectdef keyref="windowsOS"/>

<subjectdef keyref="eclipseIDE"/>
<subjectdef keyref="firefoxBrowser"/>

<subjectdef keyref="windowsOS"/>

<subjectdef keyref="ieBrowser"/>
<subjectdef keyref="visualStudioIDE"/>

Attributes

Name Description Data Type Default Value Required?
univ-atts attribute group (includes select-atts, id-atts, and localization-atts groups) A set of related attributes, described in univ-atts attribute group      
global-atts attribute group (xtrf, xtrc) A set of related attributes, described in global-atts attribute group      
class A common attribute described in Other common DITA attributes      
Parent topic: 3.1.5.1 Subject scheme maps
Previous topic: 3.1.5.1.16 subjectRelTable
Next topic: 3.1.5.1.18 subjectRel

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